Sandpapering-machine.



H. W. SELLNER. SANDPAPERING MACHINE; APPLICATION FILED 001214, 1912. RENEWED NOV. 15, 1913.

1,094,484. Patented Apr. 28, 1914.

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H. W. SELLNER. SANDPAPERING MACHINE. APPLIOATION FILED 001214, 1912. RENEWED NOV. 15, 191s.-

1 094 484. Patented Apr.- 28, 1914.

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HERBERT W. SELLNER, OF FARIBAULT, MINNESOTA.

SANDPAPERING-MACHINE.

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Application filed October 14, 1912, Serial No. 725,594. Renewed November 15, 1913.

To all whom it may concern Be it known that I, HERBERT W. SELLNER, citizen of the United States, residing at Faribault, in the county of Rice and State of Minnesota, have invented certain new and useful Improvements in Sandpapering-Machines, of which the following is a specification.

This invention relates to improvements in machines for sandpapering or polishing the surfaces of articles of wood or other materials, and particularly to the mechanism of such machines by which pressure is applied to the polishing member.

The especial objects of the improvements hereinafter described are to provide flexible means for applying the pressure on an enc less polishing or sandpapering belt, and

means cooperating with said flexible means whereby the pressure upon any given area may be increased or diminished with great nicety, thus simulating the results accomplished by hand polishing which is generally conceded to be superior to machine work.

In the accompanying drawing I have illustrated my invention in an approved form in the following views Figure 1 shows in side elevation my improvements applied to a sandpapering machine of conventional form, only so much of the machine proper being shown, as is necessary to disclose the operative connection of my improvement. Fig. 2 is an end elevation of the pressure controlling mecha-' nism which constitutes my invention. Fig. 3 is a top plan view of my invention; and Figs. 4 and 5 are details of the pressure shoes and adjacent parts.

Referring to the details ofthe drawings, 6, 6, represent the end supporting standards of a polishing machine on which are mounted pulleys 7 and an endless sandpaper or polishing belt 8, a work supporting table 9 with adjusting devices 10, 10 all of which form no part of my invention but are merely included to show the operative connections.

6 represents a rear frame member of the machine which is rigidly connected with standards 6, and supports the operative,

parts of my invention.

11, 11, represent bracket frames of corresponding form, which are arranged near the standards 6, and are connected with the frame member 6 by parallel links 12, s clearly shown in Fig. 2. The brackets 11 are Specification of Letters Patent.

Patented Apr. 28, 1914.

Serial No. 801,258.

formed with forward extensions 11*, and

rearward angular extensions 11".

Rods 13 have their forward ends fixed in the extensions 11", and their rear ends are secured in the ends of a bar 15 which extends longitudinally of the machine and is rigidly connected at its ends with the brackets 11. At the center and rear side of the bar 15, is an arm 15 to which is connected the inner end of a lever 14 which is pivoted at 14: on the frame member 6 and has a counterweight la adjustably mounted thereon, which is designed to neutralize gravity in its action on the frame made up of the brackets 11 and the members supported thereby.

16 represents a rectangular, in cross-sea tion, pressure bar, the ends of which are loosely held in openings 11 in the extensions 11 of the brackets 11, and are vertically adjustable therein by screws 11*. Upon the bar 16 are arranged a number of shoes 17, (Figs. 4; and 5) the bar 15 passing through an opening 17 in each shoe and held under compression therein by a coil spring 17* which bears downwardly upon the bar. The upper surface of each shoe is convex as at 17, and the bottom or base is flat, as at 17 To the under side of the base 17, is glued, or otherwise secured, a flexible leather strip 8 which engages the sandpaper or polishing belt 8.

18 represents a pressure roller which is arranged diagonally above and in frictional contact with the convex tops of the shoes 17. The spindles l8 of the roller 18 are iournaled in blocks 19 slidably mounted on the rods 13. The blocks 19 are actuated by means of links 20 pivotally connected thereqwith and with one arm of bellcrank levers .21,

21. The other arms of these levers are pivotally' connected with the opposite ends of a bar 22. In the center of the bar 22 is a vertical stud 23 which fits loosely a slot 24 in a lever 9A pivoted at 2 1* to the extension 15 of the bar 15. The free end of the lever terminates in a handle 2 1 by which it may be manually operated.

From the construction described, it appears that a movement of the lever 2 1 in a horizontal plane, either to the right or left, will cause the roller 18 to move over the tops 17 of the shoes 17 and thereby depress said shoes vertically to an extent dependent upon the relative positions of the roller and the convex surface of the shoe which it engages, it being understood that the spindles of the roller 18 have no vertical movement, while the shoes will yield with the compression of the springs supporting them. As the sanding belt 8 passes below the strip 8*, it will be pressed downwardly by the shoes. As the bar 16 is adjustable vertically by the screws 11 the degree of compression of the springs 17 is controlled by raising or lower ing said bar.

Having thus described my what I claim as new is 1. In sanding or polishing machines, comprising a traveling belt and means for driving same, a swinging frame, a plurality of shoes mounted under tension on said frame, a single continuous pressure member arranged above and in contact with said shoes in a plane diagonal thereto, means for moving said member over said shoes, and means for regulating the tension of said shoes.

2. In a sanding machine, comprising a traveling belt, and means for driving same, a swinging frame, a plurality of shoes mounted under tension on said frame and having convex tops, a single continuous pressure roller arranged above and in contact with said shoes in a plane diagonal thereto, means for moving said roller over said shoes, and common means for regulating the tension of said shoes.

invention,

I able means 3. Inasanding or polishing machine comprising a traveling belt and means for driving same, a swinging frame, a roller mounted on and extending longitudinally of said frame, a plurality of shoes adapted to be depressed by said roller, yielding adjustfor adjusting said shoes relative to said roller, said means common to all of said shoes, and means for adjusting said roller relative to said shoes.

4. In a sanding or polishing machine, comprising a traveling belt and means for drivmg same, a row of shoes, a flexible strip secured to the bottoms of said shoes, a bar extending longitudinally through said shoes, yielding bearings between said bar and each of said shoes, means for adjusting said bar, a pressure member extending diagonally of said row of shoes and in frictional engagement therewith, and means for varying the position ofsaid member relative to said shoes substantially in the manner set forth.

In testimony whereof I aflix my signature in the presence of two witnesses.

E. H. GIrsoN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

. Washington, D. C. 

